I wasn't familiar with the shortcomings of SSSR identification, but it makes
complete sense.  I know that Daylight determines 'R' membership using SSSR
(http://www.daylight.com/dayhtml/doc/theory/theory.smarts.html), so it seems
likely that the SMARTS default would be to determine 'r' using SSSR as well.  

Any thoughts on:
(a) how to track down if this is the issue?
(b) what to do about it other than just move to using OpenEye?

Since I devoted quite a bit of time to developing scripts in PyBel for
processing these molecules I'd really like to stay within OpenBabel SMARTS
searching if I can.  



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